RAPID CITY, S.D. — Pennington County sheriff’s officials say deputies tried to negotiate with an armed man who had barricaded himself in a van at Mount Rushmore National Park, but later found him dead of a self-inflicted gunshot wound.

The sheriff’s office got a call requesting assistance from the National Park Service about 8:30 p.m. Sunday. Rangers tried to pull the man over for a traffic violation and said he produced a handgun and then barricaded himself in the conversion van.

The Special Response Team was called when officers determined he had additional firearms. Officers tried to negotiate with the man and finally entered the van about 2:30 a.m. Monday and found him dead.